package com.shengzai.rdd

import org.apache.spark.rdd.RDD
import org.apache.spark.{SparkConf, SparkContext}

object Demo16Sort {
  def main(args: Array[String]): Unit = {
    val conf = new SparkConf()
    conf.setMaster("local")
    conf.setAppName("Filter")
    val sc = new SparkContext(conf)

    val stuRDD: RDD[String] = sc.textFile("hadoop_code/src/data/students.txt")

    val sortByRDD: RDD[(String, Int)] = stuRDD.map(
      line => {
        val split: Array[String] = line.split(",")
        (split(0), split(2).toInt)
      }
    ).sortBy(
      kv => kv._2,false //ascending =false 倒序排序
    )
    sortByRDD.foreach(println)
  }

}
